Constantino Carlos Reyes-Aldasoro is correct. If you want to see the implementation of a P-coded file you will need to ask the author or distributor of that file for the corresponding plain text file.
If this is a P-coded file distributed by MathWorks generally we will not provide the corresponding plain text script, function, or class file. My guess from the name is that it simply sets some parameters (based on the inputs with which that function is called?) on a controller object. I suspect if you assume that's what it does you should be able to understand what the rest of the code around it is doing.